Flipper is an animation library for Roblox based around Motors and Goals.

Installation

Rojo

0.6.x+

Add this repository as a submodule into your packages directory. This example assumes the directory is packages.

git submodule add https://github.com/Reselim/Flipper packages/Flipper

0.5.x

Copy the src folder from this repository into your packages directory.

npm (for roblox-ts)

Install the @rbxts/flipper package using npm or yarn.

npm i @rbxts/flipper

Without Rojo

Download the latest .rbxm file from the releases page and drag it into studio.

Usage

With Roact

This example creates a button that shrinks when pressed.

local Example = Roact.Component:extend("Example")

function Example:init()
	self.motor = Flipper.SingleMotor.new(0)

	local binding, setBinding = Roact.createBinding(self.motor:getValue())
	self.binding = binding

	self.motor:onStep(setBinding)
end

function Example:render()
	return Roact.createElement("ImageButton", {
		Size = self.binding:map(function(value)
			return UDim2.new(0, 100, 0, 100):Lerp(UDim2.new(0, 80, 0, 80), value)
		end),
		Position = UDim2.new(0.5, 0, 0.5, 0),
		AnchorPoint = Vector2.new(0.5, 0.5),

		[Roact.Event.MouseButton1Down] = function()
			self.motor:setGoal(Flipper.Spring.new(1, {
				frequency = 5,
				dampingRatio = 1
			}))
		end,

		[Roact.Event.MouseButton1Up] = function()
			self.motor:setGoal(Flipper.Spring.new(0, {
				frequency = 4,
				dampingRatio = 0.75
			}))
		end
	})
end

return Example

Flipper works wonderfully with Roact on its own, but if you plan on using it for a lot of your components, roact-flipper will make that much easier.

Without Roact

Check out the demo script in the test project!

License

Flipper is licensed in full under the MIT license. Note that it contains code from another author, which is also under the MIT license.